Transport Canada
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Table 1 - Initial Isolation and Protective Action Distances (Metric units)

Change to imperial units
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First
ISOLATE
in all directions

Then
PROTECT
persons Downwind during
First
ISOLATE
in all directions

Then
PROTECT
persons Downwind during
 
 
Day
Night
 
Day
Night
IDName of Materialmkmkmmkmkm
1005Ammonia, anhydrous300.10.21500.82.3
1005Anhydrous ammonia300.10.21500.82.3
1008Boron trifluoride, compressed300.10.63001.94.8
1008Boron trifluoride300.10.63001.94.8
1016Carbon monoxide, compressed300.10.11500.72.7
1016Carbon monoxide300.10.11500.72.7
1017Chlorine600.41.66003.58
1023Coal gas300.10.1600.30.4
1023Coal gas, compressed300.10.1600.30.4
1026Cyanogen gas300.20.915013.5
1026Cyanogen300.20.915013.5
1040Ethylene oxide with Nitrogen300.10.21500.82.5
1040Ethylene oxide300.10.21500.82.5
1045Fluorine300.10.31500.83.1
1045Fluorine, compressed300.10.31500.83.1
1048Hydrogen bromide, anhydrous300.10.43001.54.5
1050Hydrogen chloride, anhydrous300.10.4600.31.4
1051Hydrocyanic acid, aqueous solutions, with more than 20% Hydrogen cyanide600.20.64001.64.1
1051Hydrogen cyanide, stabilized600.20.64001.64.1
1051AC (when used as a weapon)1000.31.110003.87.2
1051Hydrogen cyanide, anhydrous, stabilized600.20.64001.64.1
1052Hydrogen fluoride, anhydrous300.10.53001.73.6
1053Hydrogen sulfide300.10.430026.2
1053Hydrogen sulphide300.10.430026.2
1062Methyl bromide300.10.21500.72.2
1064Methyl mercaptan300.10.32001.34.1
1067Dinitrogen tetroxide300.10.44001.13
1067Nitrogen dioxide300.10.44001.13
1069Nitrosyl chloride300.21.18004.211.0+
1071Oil gas300.10.1600.30.4
1071Oil gas, compressed300.10.1600.30.4
1076Diphosgene300.20.2300.40.5
1076CG (when used as a weapon)2001.1410007.511.0+
1076Phosgene1000.72.65003.39.7
1076DP (when used as a weapon)300.20.72001.12.6
1079Sulphur dioxide600.31.24002.15.7
1079Sulfur dioxide600.31.24002.15.7
1082Trifluorochloroethylene, stabilized300.10.2600.41
1092Acrolein, stabilized1001.13.3100011.0+11.0+
1098Allyl alcohol300.10.2600.61.1
1135Ethylene chlorohydrin300.20.3600.71.2
1143Crotonaldehyde, stabilized300.10.1600.40.7
1143Crotonaldehyde300.10.1600.40.7
1162Dimethyldichlorosilane (when spilled in water)300.10.3600.62
1163Dimethylhydrazine, unsymmetrical300.20.51001.32.4
11631,1-Dimethylhydrazine300.20.51001.32.4
1182Ethyl chloroformate300.10.2600.40.7
1183Ethyldichlorosilane (when spilled in water)300.10.3600.72.2
1185Ethyleneimine, stabilized300.20.51001.12.2
1196Ethyltrichlorosilane (when spilled in water)300.10.33000.82.7
1238Methyl chloroformate300.20.61501.22.5
1239Methyl chloromethyl ether300.31.12002.55.1
1242Methyldichlorosilane (when spilled in water)300.10.3600.82.5
1244Methylhydrazine300.30.71501.52.5
1250Methyltrichlorosilane (when spilled in water)300.10.2600.62
1251Methyl vinyl ketone, stabilized1501.63.6100011.0+11.0+
1259Nickel carbonyl1501.44.9100011.0+11.0+
1295Trichlorosilane (when spilled in water)300.10.3600.72.3
1298Trimethylchlorosilane (when spilled in water)300.10.1300.41.2
1305Vinyltrichlorosilane, stabilized (when spilled in water)300.10.2600.62
1305Vinyltrichlorosilane (when spilled in water)300.10.2600.62
1340Phosphorus pentasulfide, free from yellow and white Phosphorus (when spilled in water)300.10.2600.41.5
1340Phosphorus pentasulphide, free from yellow and white Phosphorus (when spilled in water)300.10.2600.41.5
1360Calcium phosphide (when spilled in water)600.41.55004.411.0+
1380Pentaborane600.72.34004.68.9
1384Sodium dithionite (when spilled in water)300.10.2300.31.2
1384Sodium hydrosulphite (when spilled in water)300.10.2300.31.2
1384Sodium hydrosulfite (when spilled in water)300.10.2300.31.2
1397Aluminum phosphide (when spilled in water)600.51.96005.711.0+
1412Lithium amide (when spilled in water)300.10.1300.31

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